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K81

Low-Friction High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation of hydraulic cylinders over a wide range of medium- to high-pressure sealing applications. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K81

Low-Friction High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation of hydraulic cylinders over a wide range of medium- to high-pressure sealing applications. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K81B2

Premium Low-Friction High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation for hydraulic cylinders over a wide range of high-pressure sealing applications. Back-up rings handle larger clearances, elevated temperatures, misalignment, high pressures and ultra-high pressure spikes. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	5,000psi (350bar)	7,500psi (520bar)	-40°F to 400°F (-40°C to 210°C)	5ft/s (1.5m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	6,000psi (420bar)	10,000psi (700bar)	-40°F to 400°F (-40°C to 210°C)	5ft/s (1.5m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure or for any advice, please contact engineering@ahpseals.com

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K81B2

Premium Low-Friction High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The filled-PTFE cap provides low friction and smooth operation for hydraulic cylinders over a wide range of high-pressure sealing applications. Back-up rings handle larger clearances, elevated temperatures, misalignment, high pressures and ultra-high pressure spikes. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	5,000psi (350bar)	7,500psi (520bar)	-40°F to 400°F (-40°C to 210°C)	5ft/s (1.5m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	6,000psi (420bar)	10,000psi (700bar)	-40°F to 400°F (-40°C to 210°C)	5ft/s (1.5m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure or for any advice, please contact engineering@ahpseals.com

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K81S

Split Ultra-High Pressure Bi-Directional Hydraulic Piston Seal

Split piston cap seal for high-pressure heavy-duty piston sealing applications. The hard wearing, self-lubricated Nylon cap is step cut for easy installation without special installation tools and provides high extrusion resistance for ultra-high pressure spikes up to 12,500psi. This seal is capable of repeatedly passing over cylinder ports. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Duraloy 5101	5,000psi (350bar)	10,000psi (700bar)	-40°F to 248°F (-40°C to 120°C)	3.3ft/s (1m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, sea water, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
*Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. For pressure above 3.000psi (210bar)or temperature above 200°F (95°C), please contact engineering for seal material and hardware specification.

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K82

Low-Friction Hydraulic Piston Seal

O-ring-energized low-friction uni-directional filled-PTFE piston cap seal provides smooth movement, low-friction sealing for low- to medium-duty service applications. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K82

Low-Friction Hydraulic Piston Seal

O-ring-energized low-friction uni-directional filled-PTFE piston cap seal provides smooth movement, low-friction sealing for low- to medium-duty service applications. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	13ft/s (4m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact engineering@ahpseals.com

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K8A

High-Pressure Bi-Directional Hydraulic Piston Seal

O-ring-energized cap seal design. The specially designed hard wearing, 60 shore D, self-lubricated polyurethane cap is much easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes up to 10,000psi. The small axial seal height reduces piston height, weight and cost. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Duralast 4203	3,800psi (260bar)	5,000psi (350bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, sea water, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Duralast 4403	5,000psi (350bar)	8,000psi (520bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	same as Duralast 4203
Additional standard materials available: High-performance polyurethanes, low- and high-temperature, FDA-compliant seal material grades, engineered thermoplastics, Hytrel®, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Silicone, and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, please contact engineering@ahpseals.com

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K8B

Premium High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energized cap seal design for high-pressure piston sealing applications. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The specially designed hard wearing cap is easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Duralast 4203	3,800psi (260bar)	5,000psi (350bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, sea water, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Duralast 4403	5,000psi (350bar)	8,000psi (520bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	same as Duralast 4203
Additional standard materials available: High-performance polyurethanes, low- and high-temperature, FDA-compliant seal material grades, engineered thermoplastics, Hytrel®, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Silicone, and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, please contact engineering@ahpseals.com

Compare

K8B

Premium High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energized cap seal design for high-pressure piston sealing applications. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The specially designed hard wearing cap is easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Duralast 4203	3,800psi (260bar)	5,000psi (350bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, sea water, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Duralast 4403	5,000psi (350bar)	8,000psi (520bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	same as Duralast 4203
Additional standard materials available: High-performance polyurethanes, low- and high-temperature, FDA-compliant seal material grades, engineered thermoplastics, Hytrel®, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Silicone, and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, please contact engineering@ahpseals.com

Compare

K8B

Premium High-Pressure Bi-Directional Hydraulic Piston Seal

Rectangular energized cap seal design for high-pressure piston sealing applications. Rectangular energizer ensures a stable, positive seal and provides continuous contact along the sealing surface. The specially designed hard wearing cap is easier to install than PTFE cap seals and provides high extrusion resistance. Further, the design provides a fluid reservoir between the two beveled sealing lips which retains system fluid, resulting in reduced running and breakaway friction. Beveled sealing lips for maximum fluid sealing ability protect against extrusion during pressure spikes. The small axial seal height reduces piston height, weight and cost. ISO 7425-1 and many standard and custom sizes available.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Duralast 4203	3,800psi (260bar)	5,000psi (350bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, sea water, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids
Duralast 4403	5,000psi (350bar)	8,000psi (520bar)	-22°F to 260°F (-30°C to 125°C)	1.6ft/s (0.5m/s)	same as Duralast 4203
Additional standard materials available: High-performance polyurethanes, low- and high-temperature, FDA-compliant seal material grades, engineered thermoplastics, Hytrel®, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Silicone, and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, please contact engineering@ahpseals.com

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K8C

Low-Friction No-Drift Bi-Directional Hydraulic Piston Seal

The design includes an integrated rubber quad ring seal in the outer filled-PTFE cap to ensure positive sealing and drift-free operation in medium- to heavy-duty service application. Designed to separate and seal two different media, e.g. fluid/gas. Commonly used in piston accumulators, mobile hydraulics and where low-friction, high-pressure drift-free sealing performance is required. Retro fits seals of similar design.

Operating Range

Material	Operating Pressure up to	Maximum Pressure up to	Temperature	Surface Speed up to	Fluid, Media Compatability
Permachem 6643	3,800psi (260bar)	5,000psi (350bar)	-40°F to 400°F (-40°C to 210°C)	6ft/s (1.8m/s)	mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, most modern hydraulic fluids and gases
Permachem 6150	5,000psi (350bar)	6,000psi (420bar)	-40°F to 400°F (-40°C to 210°C)	6ft/s (1.8m/s)	same as Permachem 6643
Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.
Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure or for any advice, please contact engineering@ahpseals.com

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K81

K81

K81B2

K81B2

K81S

K82

K82

K8A

K8B

K8B

K8B

K8C

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